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Interannual and long-term variability of Indian summer monsoon rainfall

Parthasarathy, B (1984) Interannual and long-term variability of Indian summer monsoon rainfall. Proceedings of the Indian Academy of Sciences - Earth and Planetary Sciences, 93 (4). pp. 371-385.

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Abstract

Analysis of summer monsoon (June to September) rainfall series of 29 subdivisions based on a fixed number of raingauges (306 stations) has been made for the 108-year period 1871-1978 for interannual and long-term variability of the rainfall. Statistical tests show that the rainfall series of 29 sub-divisions are homogeneous, Gaussian-distributed and do not contain any persistence. The highest and the lowest normal rainfall of 284 and 26 cm are observed over coastal Karnataka and west Rajasthan sub-divisions respectively. The interannual variability (range) varies over different sub-divisions, the lowest being 55 and the highest 231 of the normal rainfall, for south Assam and Saurashtra and Kutch sub-divisions respectively. High spatial coherency is observed between neighbouring sub-divisions; northeast region and northern west and peninsular Indian sub-divisions show oppositic correlation tendency. Significant change in mean rainfall of six sub-divisions is noticed. Correlogram and spectrum analysis show the presence of 14-year and QBO cycles in a few sub-divisional rainfall series.

Item Type: Article
Additional Information: Copyright of this article belongs to Indian academy of Science
Uncontrolled Keywords: 81; interannual variability; spatial coherency; summer monsoon
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 20 Apr 2015 17:42
Last Modified: 20 Apr 2015 17:42
URI: http://moeseprints.incois.gov.in/id/eprint/1272

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